You can still install it as a local extension in developer mode:
-1. Go to <chrome://extensions> and turn on developer mode (top right)
+1. Go to `chrome://extensions` and turn on developer mode (top right)
2. Download <a href="/newtab.git/tree/build/newtab.crx" download="/newtab.git/tree/build/newtab.crx">build/newtab.crx</a> ("Save link as...", don't install it straight away - see below)
3. Drag the file onto the extensions page to install it